Joou-sama no Eshi

Fujimaki barely scrapes by in school grade-wise. But he thinks all is well, because he just has to quit school and become a top-selling Mangaka. It is that easy! One day he catches his hyper-intelligent classmate Yukimori masturbating to Ero-Manga in an abandoned room in School. One thing leads to another and he gets blackmailed into drawing Ero-Manga for her.